Offer a potentially beneficial effect on health when consumed as part of a varied diet on a regular basis at effective levels

looks like the answer is     c     to me!

geologic time scale (for gradpoint) =)

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .